Start the game with the 'funlabs' parameter:
mostwanted.exe -funlabs
Now, while in the game open the console with the [~] and type in the following cheats (1 = effect enabled, 0 = effect disabled):
godMode (0/1) - God mode
godModeTeam (#) - God mode for your team
noclip (0/1) - No clipping mode
mw_showhud (0/1/2) - Hide HUD
mw_aiDisableThink (0/1) - Disable AI
mw_aiDisableAct (0/1)
mw_failmission (0/1)
mw_winmission (0/1)
mw_givealllevels (0/1)